Explanation/Reference:
Explanation:
Bootrec.exe tool to troubleshoot "Bootmgr Is Missing" issue. The /ScanOs option scans all disks for installations that are compatible with Windows Vista or Windows 7.
Additionally, this option displays the entries that are currently not in the BCD store.
Use this option when there are Windows Vista or Windows 7 installations that the Boot Manager menu does not list.

Incorrect Answers:
A: BCDEdit is a command-line tool for managing BCD stores. It can be used for a variety of purposes, including creating new stores, modifying existing stores, adding boot menu options, /Createstore Creates a new empty boot configuration data store.
The created store is not a system store.
B: Bootrec.exe tool to troubleshoot "Bootmgr Is Missing" issue. The /ScanOs option scans all disks for installations that are compatible with Windows Vista or Windows 7.
Additionally, this option displays the entries that are currently not in the BCD store.
Use this option when there are Windows Vista or Windows 7 installations that the Boot Manager menu does not list.
References:
https://technet.microsoft.com/en-us/library/cc709667(v=ws.10).aspx
http://support.microsoft.com/kb/927392/en-us